Based on 3,208 research-grade iNaturalist observations in Illinois, Gray Catbird is most often recorded in May; in Illinois it behaves like a seasonal. It ranks #42 among birds recorded in the state in our data.
Dumetella carolinensis
Gray Catbird in Illinois by month
Bars show research-grade observations per month. They mix true seasonality with how often people are outdoors, so treat small numbers with caution.
Also seen in Illinois in May
Red-winged Blackbird

American Robin
Canada Goose

Mallard

Baltimore Oriole

House Sparrow

Northern Cardinal

Rose-breasted Grosbeak
Places to look in Illinois
Cahokia
Botanical GardenMorton Arboretum
Shawnee National Forest
Chicago Botanic Garden
Ladd Arboretum
State ParkStarved Rock State Park
FAQ
When does Gray Catbird appear in Illinois?
Mainly May–June, with the most records in May.
How common is Gray Catbird in Illinois?
It ranks #42 by number of iNaturalist observations among birds in Illinois (3,208 records in our sample).